Camera-shutter.



J. A. DUNCAN, JR.

CAMERA SHUTTER.

APPLICATION FILED Nov. 14, 1912.

Am mi. 1m mmm Nm ds e2 LIU D Le LIU a D...

J. A. DUNCAN, JR.

CAMERA SHUTTER.

APPLICATION FILED Nov.14, 1912.

Patented Nov. E0, g.

2 SHEETS-SHEET 2.

r l'. Iig/gill W/NESSES t fin' enmienda omnes,

.Ionnn'nnivcnm :ing or sm. 'Josnimns'sonsn resident of Se. Joseph, in' the wntvf' Bhchnnan and: State Missouri',v hevegin'-v vented a: new and Improved CamerafShute ter, of which the following' isew fuihcleax", andexnct description.1

This invention relatesl tocameravshutters,-

und is particularly directed' to improvements wherebypioturesfma bel teken:l iu:

the shortest'pos'sible sp'ae'o f time, the'con struction being such that a maximum of lightr' in ev given interval is admitted to the camere. yIhe construction also embodies improve# ments whereby the speed' et', whichl the shut'- ter operatesf can be quicklyr` adjusted" forl either instantaneous or time exposures.

The -invention furthercontemplates a structure which can be operated infront of,

between, or behind thecamera lenses, being also adaptedffor use as an attachment to cameras. f

The parti-Culex' construction set forth. is capable offmodication' in many of the details, whereby the functions outlined can he performed, the particular embodiment set orth'beingmerely preferred'. v

Reference is to be had to the ace'em panying drawings forming ai part of this specification, in which like characters of reference indicate corresponding parts 1n all the views, and in Whic Figure 1 is a front' View of the construction embodyingthe invention; Fig. 2 is an interior View WithA the-front removed; Fig. 3 is a sectionai viewon'the line-343- o-Fig: 1; Fig. 4: is'a sectional view'on' the line4-4' oflFig. 2; Fig; 5'is a sectional view on line 5 5 ofFig. 3'whi1e Figs. 6, 7 and 8` illustrate-details of the mechanism for stopping the'- shutters in a determined ord'erl topermit time exposures. l

The construction shoWni embodies a: casing consisting essentially of the front 1.

back 2, sides 3, top 4, and bottom; 5', the

actuating'A mechanism being contained `With'- in' the casing, ,wherebyv a compact; andportable :mechanism is provided.

The frontf'l is provided with an opening- 6 into which the tube 7 isentered; the front portion of"l the tube'beingexteriorly thread ed at 8 find-l interiorly threafded. at 9, the rear portionthereobeing providedv with a shoulder' 101 sindY an' intermediate# shmiider Jr., et citizenv of* the United Stetes, and a position in.

lf'lhe. threads. 9 are hdeptedl to ig; xeeeivef tlifringcontainingf the lens, the exgteriongthreads: Shaving-,w fixed ring 12 thereon bearing. against the front 1 whereby the pertsfere held in position.-

i l'- Reerring'perticulsrly: tey Fig.V 3, it willV benotdethnt the intermediate shoulder 11 51e closelj,r adjilcent: the rear sidezof the front 21'," vthe shoulder 101 being' spaced fromthe f front@ a. distance ,sufficient toV movabiy sup- {porti sapiens 13 on the. said shoulder 11. The: front` is. further provided with en :arcuate slot 124;, adjacents whichv is e pertief '.ringzg'l 'having a 'number of notches 16 `therein', referring particularlyto-Fig. '3, it' AWill-fbenotedz'that e: in. 17 secured to the. said=platea13f extends 4t rough the said: arcuate slot .14,.being thereby accessiblefoutside of. thecasing, this pin beingprovided-With e: channel 18 and e finger 19 pivotell; vmounted at'20Within the slot, adeafspring 21, also within the said slot, maintaining the pin inthe positionshown in Fig. 3., in en` gegement in any onelo thevfnotches 16 sdjacentfthe'saidslot.

Referring Howto-Figs. 2 and e', the beck 2fof.',the oasingffisprovided' with an opening 22 into which the-.threaded ring 23 is entered, which ring is adapted to receive a lens,v if so; desired?. Gloselyadjacent the said beck andi pivotally supported on the pins- 21' lare' the blades 25, coperatively forming@ shutter, .eachof the blades beingl provided with arsegmentelopening'26, the

limitsfof-.Whichrare determined by drawing fl:

aros; as vshtiwinwith they ins 242 as' centers, .thebounding linesofzt e said openings l being' tangents t'o theiperiphery of thel `opening 22y andt touching the said pins 24.

Movsbly mountedfons-support 27 is a lever made upof the armsf285- each ofthe arms Carnyin .pins29-with Which-.the links 30 are `enge thefo'ther, endsofthe links engagingt e seid;blades 25 atthe ivotnl .points 312v Itistofhenotedfmm Fi'gg2'that the hjcpenfcomer portion of each one oi:V the biidesi-is provided with-'ani oiset: 32, the

particular' purposeY of which; will?. be. pres-X lower portion of theV plate 13 is providedl with a .shoulder 33'v having a, groove 34- therein; xed to this shoulder 33, and in such a position that when they blades. ere inthe positiontshnwn imFig. mithesves iid# . neutralizes "gagement at 28.y The use of the lug and the springs l being provided 'j wit Atically under the said opening 22, is a'lug rings 36 secured to its ends, the springs ying in the roove 34 and having their other ends in pivotal en- 37 with the ends of the said 35 having helical s arms 36 does not necessarily requlre the particular structureshown, as a continuous spring:- may be availed of, merely secured to the.-

said shoulder y33, the particular purpose of the springs 36 contemplating. that inthe positionshown in Fig. 2 the ei'fect of each the other-. Fixed within the casing, and preferably to the topl 4, and offa width substantially equal to the combined widths of the blades 25, is '-a flat -spring 38 securedJ at a middle oint, the ends thereof lugs 39; -pivotally mounted on the said pin 27 is a lever 40 having the oppositely extending .arms 41 Alving' adjacent the ends of the said spring, l this lever extending without thecasing'V throughan opening in the side 3, .and being preferably provided with a iingerhold 42 at its end. In order to permit an-uup and down movement of the lever 40 about the pin 27, and at the same time prevent hthe admission of light to the interior of the casing, the opening in the side 3 is covered by means of a Vplate 43, moving with the said lever 40,. and maintained in close engagement with the said side by means of a spring 44 carried on the lever, having one end fixed thereto in any suitable manner, as against a shoulder 45. Extending laterally from the back 2 are stops 46 adapted toengage the said blades 25 under certain conditions to be now set forth.

With the pin 17 (Fig. 3) in the middle notch 16, as shown in Fig. 1, the point of attachment of the springs 36 to the said shoulder 33 permits the blades 25 to lie in the position shown in Fig. 2, with the openings 26 therein in register so that light is continuously permitted to enter the casing through the openings provided; that is, any spring 36, or any portion of one spring if one is used, overbalancesv the other portion of the same spring, the result being that in this central position the blades are as shown. If now the pin A17 is moved toward the right or left of Fig. 1 in order to carry itadjacent other notches 16, either one of the springs 36 will be placed under tension, whereby pressure will be exerted at one end of the arms 28, the result being that the upward movement of one end of one arm, will carry one blade upwardly, and the opposite or downward movement of the other end of the other arm will carry the other blade downwardly; referring particularly to Fig. 2, the position of the pin 17 is such that the offset or shoulder 32 at the corner of the blade to the right engages with the odset or lug 39 at the outer end admit more or less of the spring 38, as indicated in broken lines in Fig. 2. In such position of the parts the openings 26 in thev blades are out of register, and the admission of light into the casing or through the lens is prevented,

the 'stop 46 limiting the travel of this blade. v

If now it is desired to make an instantaneous' exposure, the pin 17 is moved to the other side of the arcuate slot 14 in the ront land brought into engagement with one ofv the notches 16, the particular notchengaged depending'on the speed at which it is desired to have the `blades move in order to the pinplacing the other spring y36 under tension; if now the outer'end of the lever` 40 is moved downwardly, one of the arms 41 carried by this lever will move one end portion of the spring 3S upwardly (in this .instancethe right one), Iwhereby the engagement between the shoulders or lugs 32 and 39 -is broken, the consequencebeing that theI tension .of the springmov'es thisblade light, such movement off downwardly, which movement. is imparted to the arms` 28, the consequence being that thefother blade is moved upwardly until it engages the other stop 46 and. thel offset 32 at its upper corner engagesthe lug 39 at the left end of the spring 36. The tension present. in the-particular spring under tension determines the rapidity with which the blades` will lmove and thereby determines the amount of light which will be admitted v throrgh the opening 6 into the casing during the exposure; since these openings 26 are of particular form, that is, segmental, and since the shutters are moving in opposite directions, the light will be admitted for the longest space of time through the central axis of the lens positioned in the said opening, which is desirable, inasmuch as such central vaxis represents the point where the cones come together.

In order to provide for time exposure the mechanism shown in detail in Figs. 6, 7 and 8 is availed of. The side 3 is provided with an opening 50, and inside the casing andclosely ad]acent the opening, is a plate 51 carrying a knife-edge 52, the plate being movable to different positions through the medium of the arm 53- extending therefrom and through the said opening 50'. The knifeedge 52 is maintained in operative position, as shown in Figs. 6 and 8, by means of a hook 54 pivotally mounted at 55 to the outside of the casing, vthe hook engaging the saidarm 53 in order t0 maintain the knifeedge 52 in the path of the end of the arm 28, as shown particularly in Fig. 2, so that after the blades 25 have moved to a certain angle in order to-fully uncover the opening adjacent the lens, the engagement of the said knife-edge and armv maintains the blades in such position, the blades continuing their movement after thedetermined interval of y into the broken line position of Fig. 6, wheremimos l time through therelease of the said hook 54 by the plateil ma be moved towardl the that the knife-'edge 52 'is brought out of en? gagement and out of the pathof travel of the said end of the arm 28. Thisl spring 56 moves the knife-edge in inoperative position,

the hook 54 beingvLused to bring it into operative position, as described, the movement of the plate ljbeing preferably guided through the medium ofthe shoulder which extends throughthefsaid opening50g Y I The construction illustratedand described sets fortha new and i'mfrovedcamera shut#v teri'especially adapted For the performance ofthe functionsset vforth at the beginning` offthe specification; they provision of the springs 36 -in addition to providing motive power for the blades, also act as buers whereby vibration and shock in the operation of the parts are taken up, thereby providing for better photographs, inasmuch as movement of the camera, due to such shock or vibration is avoided.`

Having thus described my invention, whatv I claim as new and desire to-secure by Letters Patent is l. In a structure of the class described, the combination of juxtaposed blades pivot ally mounted in position, each blade being provided with an opening, the said openings coming into register during a portion of the movements of the said blades, 'a centrally pivoted lever, and means between eachl of the blades and the lever whereby movement of the ends of the leverinv one direction moves the blades in certain directions, movement of the lever .in an opposite direction moving the blades in o-pposite directions.

2. In a structure of the class described, pivotally mounted blades provided with openings adapted to register during 'a portion of the movements thereof, a rocking and spring actuated member having each end taposed and'beingfpivotally mounted 1n position, a lever, connectionsv between each blade and the lever, a ixed support, and springs extending between each end of the lever and the said support, the springs being adapted to be alternately expanded, whereby ressure is applied to one end of the said l ever` thereby moving the blades. right underthe yin uenceof the spring 56 contained within the casing, the result being 5. In a structure of the class described, the combination of a plurality of blades provided with openings, the said blades lying adjacent each other .and being pivotally `mounted imposition, the said openings be- .under tension, thereby moving the blades.

6. lIn a structure ofthe class described. the combination of juxtaposed blades provided with openings and pivotally mounted vin position, a lever, links connected to opposite ends of the lever, the links being also connected to the blades, a spring connecting the ends ofthe lever, an adjustable support engaging an intermediate portion of the spring, movement of the support in either direction placing one portion of the spring under tension, whereby the blades are moved` and a stop vfor engaging one of the blades, whereby they are held in position.

7. Inl a structure of the class described, the combination ofv plurality of juxtaposed blades provided with openings, the blades being pivotally mounted in position and adapted to move in opposite'directions whereby the said openings come into register, a lever pivotally mounted in position, links connecting the blades and the ends or" the lever, a spring connecting the ends of the lever, a movable support engaging an intermediate portion of the spring, stops s the combination of a plate revolubly mounted in position, a plurality of blades pivotally mounted in position, each of the blades being formed with an opening adapted to register, whereby light is admitted to l:he interior of the camera, a lever, the ends of lever being' connected to the blades, ps on the blades, a spring connected to the ends of the lever, an intermediate por-l tion of the spring being connected to the said plate, other stops adapted for engagement with the stops on the blades, means whereby the said plate may be turned in order to place either spring under tension, and an operating lever adapted to bring about disengagement between the said cooperating stops, whereby the tension of the movable blades .provi spring will cause the blades to move in opposite directions. y v

9. In a structure of the vvclass described, the combination of a casing provided with a 4 slot, stops adjacent the said slot, a plate mounted to oscillate, a pin carried by the plate extending through the said slot, means carried by the pin adapted to engage in one of the stops, a plurality jof blades pivotally mounted in position, vthe blades being provided with openings adapted to come into register, each of the blades lbeirg provided with an offset, a lever, theends of the lever being connected to the said plate, resiliently mounted stops adapted to coperate with the offsets on the said blades, whereby they are held in certain positions, a spring connected to the ends of the lever, the intermediate portion of the spring engaging the said plate, whereby movement of the plate will place either portion of the spring under tension, and an operating lever for bringin about disengagement between the said o sets and the said stops, whereby the blades.

are moved in opposite directions.

10. In a structure of the class described, the combination of a lurality of oppositely ed with openings pivl l otally mounted 1n position, a lever, the ends of. the lever being connected to the blades, a spring connecting the ends of the lever, a support connected .to an intermediate point of the spring, means whereby vthe support may be moved in oppositev directions in orderto place either portion' of the spring under tension, osets on the blades, movable stops `adapted to coperate Withthe osets,

an operating lever for disenaging a -stop and an oset whereby the blades are .moved in opposite directions, together with a=mov whereby the support may be moved either direction in order to place either porable 'element adapted to engage one end of the said lever when the openings in the blades arel in register, thereby stopping the blades and permitting a time exposure.

11. ln a structure of the class described,

thecombination of a plurality of oppositely movable :blades provided withopenings cooperatively Apermitting .light to enter the camera, oisetsv on the blades, movable stops for coperation';with the said offsets, a lever pivotally mounted in position at an inter I mediate' point, the ends of the lever being connected to the blades,.a spring connecting the ends of the lever, a support connected to an'intermediate portion of the spring, means 1n tion of the spring under tension, the engagement of one of the offsets with one of the stops preventing movement of the blades, a lever pivotally mounted in posi-v tion and adapted. to bring about disengagement of the said offset .and stop whereby the blades are permitted to move, together with a slidable element carried by the casing adapted to be moved into the path of travel of the end -of the said lever and engaged therewith for stopping the blades when the openings therein are in register, movement of the said element relatively to the end of `the lever lpermitting the blades to continue their movement, whereby the openings come out of register. v y

In testimony whereof I have 'signed my name to this specification in the presence of two subscribing witnesses.

' J OHNA.. DUNCAN, JR. Witnesses:

JOHN S. 'CLINKINBEARm L. GRANT' DUNCAN. 

